Refrigerating apparatus



June 9, 1931. c SCQVEL, JR 1,809,075

REFRIGERATING APPARATUS Filed April 10, 1929 51067710 7? John C. 500ml,5;

' ment directly of a low boiling temperature Patented June 9, 1931 iUNITED STATES PATENT OFFICE JOHN C. SCOVEL, JR., OF CHICAGO, ILLINOIS,ASSIGNOR 'I'O TIJIE CREAMERY PACKAGE MFG. COMPANY, OF CHICAGO, ILLINOIS,A CORPORATION OF ILLINOIS nnrnrennmme APPARATUS Application filed April10,

.The invention relates to the construction of the refrigeratingcylinders in ice cream freezers of the type adapted to theemployrefrigerant, such as ammonia, and which are commonly known asdirect expansion freezers.

I Such freezers are commonly provided with a pair'of endwardly joinedspaced concentri cylinders providing an annular boiling 0 expansionchamber for the refrigerant between the cylinders, of which the innerone is adapted to contain the liquid ice cream mix to be frozen.Heretofore, it has been I the practice to prov'de an opening in thebottom side of the on er cylinder for a pipe connection by which toadmit the liquid refrigerant to the expansion chamber, and to provideanother single opening in the top side of the outer cylinder for anotherpipe connection by which to draw off the vaporized refrigerant from theexpansion or boiling chamber.

As heretofore constructed, with the single draw-off or suction outlet,the 'eiiiciency of evaporation was greatest in a circumferential pathdirectly between the inlet and the outlet, while the boiling action" inthe refrig-- erant in the end portions ofthe expansion chamber becamesluggish and less efi'i'cient because of the accumulation of theexpanded gas or vapor in and above the liquid refrigcontents of theinner cylinder is much faster at the center portion than at eitherend'por- 4o outlets for the vaporizingrefriger'ant in the erant in theend portions remote from: the outlet, and which had to be drawnlaterally across the chamber for escape through the. outlet. Theconsequences of such conditions are that the refrigerating efiect uponthe tion,*and that the slower absorption of heat at the end portions ofthe freezer materially increases the time period necessary to freeze abatch of ice cream.

It is the object of this invention to rovide a cylinder structure forice cream reezers having an arrangement of plural suction expansionchamber so that all portions of the re rigerant therein will boiluniformly, and the refrigerating effect upon the ice cream invention,and Fig. 2 is an end 1929. Serial No. 353,917. I

Referring to the drawings, Fig. 1 is a longitudinal sectional view inelevation of an ice cream freezer cylinder embodying the view of thesame. The other component parts of an ice cream freezer being wellknownto those familiar with the art, illustration thereof is deemed notnecessary herein. 5

In the drawings, the numeral 1 indicates an inner cylinder about whichanouter cylinder 2 is positioned in concentric spaced relation, theadjacent ends of the respective cylinders being joined preferably byfiller rings 3 effecting a permanent seal between the cylinders andforming an intermediate annular chamber 4:- An' opening 5 in the] bottomportion of the outer cylinder 2 communicates with a pipe 6 threaded intoa coupling 7 preferably welded to the cylinder wall. The pipe 6 servestoconduct liquid refrigerant to the inlet opening '5 and into theexpansion or boiling chamber 4.

Upon the topside of the outer" cylinder 2 is mounted a longitudinallyextending shell v Shaving its edges sealed, preferably by welding, tothe cylinder wall, and forming a manifold enclosing with the cylinder asuction chamber 9. Spaced longitudinally I along that portion of theoutercylinder wall enclosed by the manifold, are a plurality ofopenings" 10 forming outlet passages from the expansion chamber 4 intothe suction chamber 9. A main suction outlet opening 11, in theintermediate upper portion of the manifold wall, communicates through acoupling 12, preferably welded to the manifold, with a pipe 13 servingas the suction return for the vaporized refrigerant. An outer jacket 14.may also be provided about the outer cylinder and the manifold with.spacing therebetween forv heat insulating material 15, the jacket beingendwardly supported upon filler rings 16.

' By the arrangement herein disclosed, it

will be apparent that the vapor forming in the refrigerant, as it boils1n the annular chamber 4, may rise, directly upward and find an exitinto the suction chamber 9 with but slight deflection through one of theoutlet .passages 10, with uniformity of such action throughout thelength of the expansion chamber. The suction chamber 9 and the mainsuction outlet connection 13 are of suflicient capacity to maintain anequalized suction at each of the passages 10, and uniformly clear theexpanding vapor from the expansion chamber, thereby effecting uniformrefrigerating capacity or efliciency over i the entire length of theinner cylinder 1.

I claim as my invention: 1. A-pair of spaced cylinders havingtheir endsjoined and forming therebetween a refrigerant expansion chamber, one ofsaid.

cylinders having a refrigerant inlet opening in the bottom portionthereof and having a series of spaced outlet openings in the top portionthereof, and a manifold marginally mounted on; said cylinder forming asuction chamber in outward sealed communication with said series ofoutlet openings, said manifold having a suction outlet 7 opemng.

bottom portion thereof and havin vsuction outlet therethrough.

2. A pair of spaced cylinders en dwardly joined to form arefrigerantexpansion chamber therebetween, one of said cylinders having arefrigerant inlet opening in the a series of outlet openings spaced lon'tu inally in the top portion thereof," an a manifold sealed upon saidcylinder in outward spaced enclosure of said series of outlet openings,said manifold having a suction outlet opening.

3. A pair of spaced cylinders endwardly joined to form a refrigerantexpansion chamber therebetween, the outer one bf said cylinders having arefrigerant inlet opening through the bottom portlon' thereof and havinga series of spaced outlet openings in longitudinal arrangement throughthe top portion thereof, and a centrally spaced outer enclosure wallmarginally sealed upon said outer cylinder about said outlet openings toform a suction manifold, said wall having a In witness whereof I havehereunto aifixed m si ature.

y gn Y JOHN C. SCOVEL,JR.

